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Engine-Codes – Toyota – P0122 2002 Toyota Highlander

P0122 2002 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The P0122 diagnostic trouble code (DTC) for a 2002 Toyota Highlander indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corroded or dirty throttle body. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0122 2002 Toyota Highlander indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corroded or dirty throttle body.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code P0122 2002 Toyota Highlander Description

The P0122 diagnostic trouble code (DTC) for a 2002 Toyota Highlander indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. The throttle position sensor (TPS) is a crucial component of the vehicle's electronic throttle control system, responsible for monitoring the position of the throttle pedal and sending this information to the engine control module (ECM). The ECM uses this data to adjust fuel delivery and ignition timing, optimizing engine performance and fuel efficiency.

OBDII Code P0122 2002 Toyota Highlander - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2002 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2002 Toyota Highlander

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Corroded or dirty throttle body
  4. Issues with the engine control module (ECM)
  5. Electrical problems such as a short circuit or open circuit in the TPS circuit

Symptoms of P0122 2002 Toyota Highlander

  1. Hesitation or jerking during acceleration
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Lack of power or acceleration
  5. Illumination of the check engine light

How to Fix P0122 2002 Toyota Highlander

  1. Begin by diagnosing the TPS using a scan tool to confirm the P0122 code and check for any related codes.
  2. Inspect the wiring and connectors in the TPS circuit for any damage or corrosion, repairing or replacing as necessary.
  3. Clean the throttle body to ensure smooth operation and proper airflow.
  4. Test the TPS using a multimeter to verify its functionality and replace if found to be faulty.
  5. Clear the DTC and perform a test drive to confirm that the issue has been resolved.

Cost to Fix P0122 2002 Toyota Highlander

The typical repair costs for addressing a P0122 code on a 2002 Toyota Highlander can vary depending on the specific cause of the issue. In general, replacing a faulty throttle position sensor can cost between $100 and $200, while cleaning the throttle body and repairing wiring may add additional labor costs. Overall, the total repair bill for resolving a P0122 code can range from $150 to $400, including parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

When is the Code Detected?

An excessively low voltage from the Throttle Position Sensor (TPS) is sent to Engine Control Module (ECM).

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0122 2002 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0122 in a 2002 Toyota Highlander?

The common symptoms of code P0122 include poor acceleration, rough idling, stalling, and decreased fuel efficiency.

2. What does the Throttle Position Sensor/Switch 'A' Circuit Low Input mean for a 2002 Toyota Highlander?

The code P0122 indicates that the throttle position sensor is sending a low voltage signal to the engine control module, potentially causing drivability issues.

3. What are the possible causes of the Throttle Position Sensor/Switch 'A' Circuit Low Input in a 2002 Toyota Highlander?

Possible causes of code P0122 include a faulty throttle position sensor, damaged wiring or connectors, a dirty throttle body, or a malfunctioning engine control module.

4. How can I diagnose the Throttle Position Sensor/Switch 'A' Circuit Low Input in my 2002 Toyota Highlander?

To diagnose code P0122, you can use an OBDII scanner to check for the code and perform a visual inspection of the throttle position sensor, wiring, and connectors. You may also need to test the sensor's voltage output.

5. What are some repair tips for fixing OBDII code P0122 in a 2002 Toyota Highlander?

Repair tips for code P0122 include cleaning the throttle body, checking and replacing damaged wiring or connectors, and replacing the throttle position sensor if necessary.

6. Can I drive my 2002 Toyota Highlander with OBDII code P0122?

It is not recommended to drive your vehicle with code P0122 as it can lead to poor engine performance and potential safety hazards. It is best to address the issue promptly.

7. How much does it typically cost to repair OBDII code P0122 in a 2002 Toyota Highlander?

The cost of repairing code P0122 can vary depending on the cause of the issue. Replacing a faulty throttle position sensor can cost between $100 to $200, while addressing wiring or connector issues may involve additional labor costs.

8. Will resetting the check engine light fix OBDII code P0122 in a 2002 Toyota Highlander?

Simply resetting the check engine light will not fix the underlying issue causing code P0122. It is important to diagnose the problem and make the necessary repairs to prevent the code from reoccurring.

9. How long does it take to repair OBDII code P0122 in a 2002 Toyota Highlander?

The time needed to repair code P0122 can vary depending on the exact cause and the extent of the repairs required. In general, it may take a few hours to a full day for a professional technician to diagnose and fix the issue.

10. Can a DIY enthusiast repair OBDII code P0122 in a 2002 Toyota Highlander?

While some DIY enthusiasts may have the skills to diagnose and repair code P0122, it is recommended to consult a professional technician for accurate diagnosis and proper repair to ensure the issue is resolved correctly.

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